So I recorded a short MPEG with one of those point-and-shoots from Sony (model DSC-W90.) I import it to After Effects and proceeded to duplicating and adding a simple mask. I then keyframe the path shape and feathering of a foreground shot. When I render the final shot, it is inexplicably erratic. It skips several frames and sometimes goes back a few before continuing. Assuming something was wrong with the way I rendered it, I go back to the comp and play the shot using AE's player (a.ka. pressing the spacebar.) The same thing occurs.
Anyone have any idea how to resolve this? I have "Preserve Constant Vertex Count when Editing Paths" turned off. I have tried the same masking technique with the thing on and get the same result.